Add counts to model, relationship and component

[abdullah1308]

Description

This PR add the ability to get counts for models, relationships and components. This is done to support meshery/meshery#7651

Notes for Reviewers

Signed commits

• Yes, I signed my commits.

[leecalcote]

Do we have a REST API docs update to accompany this?

[abdullah1308]

Do we have a REST API docs update to accompany this?

@leecalcote after I make the changes to the server endpoints, I'll make the corresponding docs update

[leecalcote]

Do we have a REST API docs update to accompany this?

@leecalcote after I make the changes to the server endpoints, I'll make the corresponding docs update

Sounds real good.

[Abhishek-kumar09]

@abdullah1308 Did you make sure meshery-server runs perfectly after these changes?

[Abhishek-kumar09]

are there any changes pending in meshery/meshery as well, from your side?

[abdullah1308]

are there any changes pending in meshery/meshery as well, from your side?

@Abhishek-kumar09 yes I'll put up a PR for those in a bit

[Abhishek-kumar09]

Okay, then it needs to be reverted for now, because the changes are stopping mesher-server from starting.

[leecalcote]

@abdullah1308 with that PR having been reverted, you can now open up a new PR with that code and incorporate new changes.